Github user maropu commented on a diff in the pull request: https://github.com/apache/spark/pull/20166#discussion_r160022276 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala --- @@ -228,6 +228,35 @@ case class Cast(child: Expression, dataType: DataType, timeZoneId: Option[String builder.append("]") builder.build() }) + case MapType(kt, vt, _) => + buildCast[MapData](_, map => { + val builder = new UTF8StringBuilder + builder.append("[") + if (map.numElements > 0) { + val keyToUTF8String = castToString(kt) + val valueToUTF8String = castToString(vt) + builder.append(keyToUTF8String(map.keyArray().get(0, kt)).asInstanceOf[UTF8String]) --- End diff -- ok
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